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contributor.authorMohanty, Alekhika-
contributor.authorPanda, G (Guide)-
identifier.citationStudy and Implementation of Watermarking Algorithms, Thesis submitted in partial fulfillment of the requirements for the award of the Master of Technology by Research in Electronics, to National Institute of Technology, Rourkelaen
descriptionCopyright for the thesis belongs to National Institute of Technology Rourkelaen
description.abstractWater Making is the process of embedding data called a watermark into a multimedia object such that watermark can be detected or extracted later to make an assertion about the object. The object may be an audio, image or video. A copy of a digital image is identical to the original. This has in many instances, led to the use of digital content with malicious intent. One way to protect multimedia data against illegal recording and retransmission is to embed a signal, called digital signature or copyright label or watermark that authenticates the owner of the data. Data hiding, schemes to embed secondary data in digital media, have made considerable progress in recent years and attracted attention from both academia and industry. Techniques have been proposed for a variety of applications, including ownership protection, authentication and access control. Imperceptibility, robustness against moderate processing such as compression, and the ability to hide many bits are the basic but rather conflicting requirements for many data hiding applications. A simple example of digital watermark would be a visible “seal” placed over an image to identify the copyright. However the watermark might contain additional information including the identity of the purchaser of a particular copy of the object. In this thesis issues involving digital watermarking and its applications have been addressed. In addition, a few other important problems encountered in practice, such as the requirement for reversibility of the original data after the watermark has been extracted, have been discussed here. Various issues of watermarking are studied with new principles and techniques being proposed. Extensive survey of current watermarking literatures has been done. Two watermarking algorithms have been proposed in this work. One is a reversible watermarking scheme in the VLC domain of MPEG-2 data. Other is an evolutionary watermarking scheme using genetic algorithm. The two algorithms appear under the following headings in this thesis. • A Reversible Watermarking Algorithm in the VLC domain of MPEG-2 Data • An Energy Cluster Based Watermarking Algorithm Using Genetic Algorithmen
format.extent3451589 bytes-
publisherNational Institute of Technology, Rourkelaen
titleStudy and Implementation of Watermarking Algorithmsen
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